CONDENSED CONSOLIDATED STATEMENTS OF INCOME UNAUDITED (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues
Investment advisory and incentive fees	$ 88,037	$ 87,797
Distribution fees and other income	13,743	14,873
Institutional research services	2,065	1,807
Total revenues	103,845	104,477
Expenses
Compensation	44,494	43,897
Management fee	4,437	4,728
Distribution costs	14,283	13,963
Other operating expenses	6,686	5,390
Total expenses	69,900	67,978
Operating income	33,945	36,499
Other income (expense)
Net gain from investments	6,958	6,944
Interest and dividend income	1,054	1,141
Interest expense	(2,019)	(1,992)
Total other income, net	5,993	6,093
Income before income taxes	39,938	42,592
Income tax provision	15,179	14,616
Net income	24,759	27,976
Net income attributable to noncontrolling interests	(17)	22
Net income attributable to GAMCO Investors, Inc.'s shareholders	$ 24,776	$ 27,954
Net income attributable to GAMCO Investors, Inc.'s shareholders
Basic (in dollars per share)	$ 0.99	$ 1.10
Diluted (in dollars per share)	$ 0.97	$ 1.09
Weighted average shares outstanding:
Basic (in shares)	25,132	25,481
Diluted (in shares)	25,414	25,684
Dividends declared: (in dollars per share)	$ 0.07	$ 0.06